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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/19 = (5/2)/x // - (5/2)/x
5/19-((5/2)/x) = 0
(-5/2)*x^-1+5/19 = 0
-5/2*x^-1 = -5/19 // : -5/2
x^-1 = 2/19
-1 < 0
1/(x^1) = 2/19 // * x^1
1 = 2/19*x^1 // : 2/19
19/2 = x^1
x = 19/2
x = 19/2
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